In science, a broad idea that has been repeatedly verified so as to give scientists great confidence that it represents reality is called ________
A) a theory B) a paradigm C) a Ptolemaic model D) a hypothesis
A
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What clues do other Kuiper belt comets offer about the origin of the belt?
A. The similar characteristics of Kuiper belt objects such as travel direction, orbit inclination, stable orbital resonance with Neptune, and composition suggest that these objects have the common origin and were formed in the outer region of the solar system. B. The similar characteristics of Kuiper belt objects such as travel direction, orbit inclination, stable orbital resonance with Jupiter, and composition suggest that these objects were formed in the inner region of the solar system and than draged to the farther distance. C. Kuiper belt objects have different travel direction, orbit inclination, and composition. They also do not have orbital resonances with any of the planets. It suggest that these objects were formed outside the solar system and than attracted by the gravity of the Sun and jovian planets. D. Kuiper belt objects have different travel direction, orbit inclination, and composition. They also have orbital resonances with different jovian planets. It suggest that these objects were formed in different regions of the solar system and than draged to their present orbits.
A horizontal straight wire carries a current from east to west. The resulting magnetic field lines are
A. straight lines perpendicular to the wire. B. closed circles perpendicular to the wire directed counterclockwise as viewed from the east. C. parallel to the wire from east to west. D. closed circles perpendicular to the wire directed clockwise as viewed from the east. E. parallel to the wire from west to east.
A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm. What is the electric flux through the surface of the cylinder?
A. 0.00
B. 160 
C. 244
D. 280
E. 316
An open freight car rolls friction-free along a horizontal track in vertically pouring rain. As water accumulates in the car, its speed
A) increases. B) decreases. C) doesn't change.